I bought this for my son for marching band. I also play the trumpet. It held up through band camp, but the metal began to weaken after time. As you tighten the clamp it begins to bend outward and is not able to have a solid grip on the trumpet. It also ruined the finish of the trumpet due to the lyre moving around or falling off. The only thing I see feasible with this item is to maybe use it at home for practice, but as for marching band with lots of movement I would not recommend this.

Play accordion in a traveling string band and needed a lyre to use in marching performances. There are no lyres that are specifically made for accordions and don't like the necklace model as it gets in the way and is uncomfortable to use. So made a strap on lyre out of PVC pipe and the trumpet clamp on lyre I purchased is a perfect fit for the 1/2 inch plastic pipe.